Center Brace This brace is for your motor to diff to servo. Fits all zenoah based engines, may be some compatibility issues with aftermarket bell carriers. The two peice design allows full adjustment for all gear sizes plus fine adjustment of your gear mesh.It bolts directly to the cluch housing, diff frame and the throttle/break servo. Adjust the gear mesh and lock it in place with two M-6 bolts. All hardware included except servo mounting screws. CNC machined from 7075 T-6 aluminum. Weight is 3.24 oz Fitment to Rcmax engines requires small mods to either the bell carrier or the brace.